Thomas Edison, Cornelius Burns, James R. Watt (Mayor of Albany), Mayor of Troy, Henry Ford, Harvey S. Firestone, John Burroughs, and others examining a block of sandstone.
Thomas Edison, Cornelius Burns, James R. Watt (Mayor of Albany), Mayor of Troy, Henry Ford, Harvey S. Firestone, John Burroughs, and others examining a block of sandstone.
U.S. National Park Service
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